In contrast to Tintin, Spirou is more frequently shown doing some reporting in several of his adventures. While he and reporter colleague Fantasio occasionally pursue stories, in most cases they simply find themselves in the centre of adventures. A honest and brave young man of indeterminate age, he tries to fight injustice around him and help people. He is usually more level-headed than Fantasio, who always accompanies him, along with the pet squirrel Spip, and during the period of Franquin authorship, the Marsupilami.
Spirou's design was changed through the years by the various writers and artists who created his adventures but he has kept his spiky red-hair and clothes of the same colour even after ditching his hotel uniform.
A six year old version of Spirou is the star of the spin-off series Le Petit Spirou, which is concerned with his tribulations at school and the anatomy of girls. This later series and its star are generally acknowledged to have little in common with the old one.